chapter 3 Flashcards
genetics
the science that allows one to study how traits are passed from parent to offspring
father of genetics
Gregor Mendel
Autosomes
all chromosomes other than sex chromosomes
sex chromosomes
X or Y chromosomes
Filial generation
the offspring from a mating
genotype
the genetic makeup of the offspring
phenotype
physical appearance of the offspring
true breeding
cross between homozygous dominant or recessive traits (cant be heterozygous)
incomplete dominance
a dominant allele cant mask the expression of another allele
co-dominance
two dominant alleles are going to be expressed
sex linked genes
genes that are found on the X or Y chromosome
a sex linked gene will be expressed in….
males
karyote
a preparation of an individuals metaphase chromosome’s
pedigree analysis
study of a family tree, can be used to determine whether a trait is dominant or recessive
inversion
occurs by a breakage in chromosome & it rotates 180 degrees then re-attaches, NO imbalance of genetic information & not identifiable under microscope
two types of inversion
paracentric
pericentric
paracentric
occurs outside of the centromere
pericentric
inversion that involves or spans the centromere
translocation
occurs when two non-homologous chromosomes mutate by exchanging parts, can alter size of chromosomes & position of centromere, identifiable under microscope
nondisjunction
failure of chromosomes or chromatids to separate during meiosis
DNA is composed of
sugar, deoxyribose, a phosphate group & the nitrogen bases
Adenine & Guanine
double ring structure called purine
Cytosine & Thymine
single ring structures called pyrimidine
backbone of DNA consists of
sugar & a phosphate group
rungs in DNA are the nitrogen bases..
purine & pyrimidines
primary structure
DNA in helical form. it establishes a hydrophilic & hydrophobic region
backbone region is…
hydrophillic
runs of DNA is…
hydrophobic
DNA is found in
mitochondria & or nucleus
secondary structure of DNA
unzipped DNA looks like a ladder & it establishes polarity
Griffiths experiment
showed that DNA is the genetic information
Hershey & Chase experiment
showed that DNA is the genetic information
semi conservative replication
each strand of a DNA molecule is used to make a new strand of DNA
leading strand
strand of DNA where replication is continuous
lagging strand
strand of DNA where replication is discontinuous
okazaki fragments
fragments of DNA found on the lagging strand
RNA primers
short stretches of RNA which are headed to jumpstart DNA replication